1 10 28-13 SUBJECT DATE SPN 625/FMI 9 EPA10 - GHG14 (ACM) October 2013 Additions, Revisions, or Updates Publication Number / Title Platform Section Title Change DDC-SVC-MAN-0084 EPA10/ GHG14 DD Platform SPN 625/FMI 9 EPA10 - GHG14 (ACM) New diagnostics for ACM. ACM, MCM, and CPC are referred to generically because this procedure covers more than one year. All information subject to change without notice. 3
2 SPN 625/FMI 9 EPA10 - GHG14 2 SPN 625/FMI 9 EPA10 - GHG14 This procedure applies to the Aftertreatment Control Module (ACM). This diagnostic is typically PT-CAN Heartbeat Missing. Table 1. Description Monitored Parameter Typical Enabling Conditions Monitor Sequence Execution Frequency Typical Duration Dash Lamps Engine Reaction Verification SPN 625/FMI 9 PT-CAN Heartbeat Missing. CAN Communication Always Enabled None Always Enabled 2 Seconds MIL, CEL None Ignition Cycle Check as follows: 1. Are there any battery voltage faults (any SPN 168 FMI faults)? a. Yes; troubleshoot battery voltage faults first. b. No; Go to step 2. 2. Has the Aftertreatment Control Module (ACM), Motor Control Module (MCM), or Common Powertrain Controller (CPC) been recently programmed? a. Yes; clear the fault codes. If faults do not become active, release the vehicle. If faults become active, Go to step 3. 4 All information subject to change without notice. Copyright 2013 DETROIT DIESEL CORPORATION 10 28-13
b. No; Go to step 3. NOTE: ACM, MCM, and CPC all communicate on the same CAN line. If water penetrates any connector, it can short the CAN line and may prevent communications with other ECUs. NOTE: Main battery power must be left ON. NOTE: The five minute time-frame allows the ACM to go completely offline. 3. Turn ignition OFF and wait five minutes before proceeding. 4. Disconnect ACM 21-pin 5. Inspect the 21 pin Aftertreatment Control Module (ACM) connector for corroded, unseated (pushed out) or damaged pins, bent or spread pins; inspect the connector seal for damage (signs of water or oil intrusion). b. If no contamination or damage is found, Go to step 6. 6. Check ACM internal terminating resistor by measuring and recording the resistance across pins 10 and 20 of the ACM 21-pin connector, component side. a. If the resistance is between 110 to 130 ohms, Go to step 7. b. If the resistance is not between 110 to 130 ohms, replace the ACM. Go to step 21. 7. Measure the resistance between pin 10 of the ACM 21-pin harness connector and battery ground. a. If the resistance is greater than 10K ohms, Go to step 8. b. If the resistance is less than 10K ohms, repair the short to ground on pin 10 of the ACM 21-pin harness Refer to Original Equipment Manufacturer (OEM) literature for wiring schematic information. Go to step 21. 8. Measure the resistance between pin 20 of the ACM 21-pin harness connector and battery ground. a. If the resistance is greater than 10K ohms, Go to step 9. b. If the resistance is less than 10K ohms, repair the short to ground on pin 20 of the ACM 21-pin harness Refer to Original Equipment Manufacturer (OEM) literature for wiring schematic information. Go to step 21. 9. Disconnect the CPC electrical harness connector #3. 10. Inspect the CPC connector for corroded, unseated (pushed out) or damaged pins, bent or spread pins; inspect the connector seal for damage (signs of water or oil intrusion). b. If no contamination or damage is found, Go to step 11. All information subject to change without notice. 5
2 SPN 625/FMI 9 EPA10 - GHG14 11. Check CPC internal terminating resistor by measuring the resistance across pins 19 and 21 of the CPC electrical connector #3 component side. a. If the resistance is between 110 to 130 ohms, Go to step 12. b. If the resistance is not between 110 to 130 ohms, replace the CPC. Go to step 21. 12. Check the resistance between pin 19 of the CPC harness connector #3 and pin 20 of the ACM 21-pin harness a. If the resistance is less than 5 ohms, Go to step 13. b. If the resistance is greater than 5 ohms, repair the wire between pin 19 of the CPC harness connector #3 and pin 20 of the ACM 21-pin harness Go to step 21. 13. Measure the resistance between pin 21 of the CPC harness connector #3 and pin 10 of the ACM 21-pin harness a. If the resistance is less than 5 ohms, Go to step 14. b. If the resistance is greater than 5 ohms, repair the wire between pin 21 of the CPC harness connector #3 and pin 10 of the ACM 21-pin harness Go to step 21. 14. Disconnect MCM 21-pin 15. Inspect the 21 pin Motor Control Module (MCM) connector for corroded, unseated (pushed out) or damaged pins, bent or spread pins; inspect the connector seal for damage (signs of water or oil intrusion). b. If no contamination or damage is found, Go to step 16. 16. Measure the resistance between pin 19 of the CPC harness connector #3 and pin 19 of the MCM 21-pin harness a. If the resistance is less than 5 ohms, Go to step 17. b. If the resistance is greater than 5 ohms, repair the wire between pin 19 of the CPC harness connector #3 and pin 19 of the MCM 21-pin harness Go to step 21. 17. Measure the resistance between pin 21 of the CPC harness connector #3 and pin 13 of the MCM 21-pin harness a. If the resistance is less than 5 ohms, Go to step 18. b. If the resistance is greater than 5 ohms, repair the wire between pin 21 of the CPC harness connector #3 and pin 13 of the MCM 21-pin harness Go to step 21. NOTE: Ensure ACM and MCM connectors are disconnected during this step. 18. Measure the resistance between pins 19 and 21 of the CPC harness connector #3. a. If the resistance is greater than 10K ohms, Go to step 19. 6 All information subject to change without notice. Copyright 2013 DETROIT DIESEL CORPORATION 10 28-13
b. If the resistance is less than 10K ohms, repair the harness shorted wires between pin 19 and pin 21 of the CPC harness connector #3. Refer to Original Equipment Manufacturer (OEM) literature for schematic information. Go to step 21. 19. Measure the resistance between pin 19 of the MCM 21-pin harness connector and pin 20 of the ACM 21-pin harness a. If the resistance is less than 5 ohms, Go to step 20. b. If the resistance is greater than 5 ohms, repair the wire between pin 19 of the MCM 21-pin harness connector and pin 20 of the ACM 21-pin harness Go to step 21. 20. Measure the resistance between pin 13 of the MCM 21-pin harness connector and pin 10 of the ACM 21-pin harness a. If the resistance is less than 5 ohms, install a test ACM and retest. If code does not return, replace ACM. Refer to OEM procedures. Go to step 21. b. If the resistance is greater than 5 ohms, repair the wire between pin 13 of the MCM 21-pin harness connector and pin 10 of the ACM 21-pin harness Go to step 21. 21. Verify repairs. Restore all connections. Cycle the ignition key. Is fault code still active? a. Yes; replace the ACM. Refer to OEM procedures. b. No; If fault does not become active, clear the fault codes and release the vehicle. All information subject to change without notice. 7